<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .container {
            width: 90%;
            height: 600px;
            background: #b0b0b0;
            margin: 0 auto;
            min-width: 600px; /*最小宽度*/
            min-height: 300px; /*最小高度*/
        }
        .left {
            width: 200px;
            height: 100%;
            background: #303ab9;
            float: left;
        }
        .middle {
            width: calc(100% - 200px - 200px);
            height: 100%;
            background: #b94d57;
            float: left;
        }
        .right {
            width: 200px;
            height: 100%;
            background: #3f983f;
            float: left;
            /*float: right;*/
        }
    </style>
</head>
<body>
    <h1>两列布局</h1>
    <div class="container">
        <div class="left"></div>
        <div class="middle"></div>
        <div class="right"></div>
    </div>
</body>
</html>